you get to secretary of state hillary clinton warning the u.s. was prepared to act if syria used chemical weapons if they're using them, so then what -- run through possible scenarios for me? >> well, the u.s. always said its red line is the use of chemical weapons. and of course you can imagine that people at the state department and other agencies in washington are very much looking into whether or not syria is simply moving stockpiles around, or preparing for some sort of use. if syria indeed, which is saying it's not going to do, uses the weapons out of desperation, because here you have some rebel strongholds that is not bowing to the syrian regime, despite the fact that it is repeatedly conventionally bombed. when you reach a level where there is desperation for a regime that feels everything around it is crumbling, the question is what will it use in order to try in some desperate last ditch measure to protect itself. that is the concern. the u.s. has always said this is a concern because it is not just within the borders of syria, that it